63 Dart overheating issue

Dicer said

Yes, I have read that later in the tread, I guess I spoke too soon. Reading about the freeze plugs being "MIA" gets me to thinking. Crack block, cracked head, bad head gasket can all cause overheating problems. I wish you the best, you really did a nice job on this auto sir......

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I had been concerned about that as well at first but I found the originals in a box in the trunk and they were corroded out. That was why they were removed. I have replaced the head gasket and have had no signs of a cracked head or block. Have monitored for leaks and coolant in oil or exhaust. None in either.